Just a 'lil update:
i "decided" to continue to use kerosene (because i really had no choice....either use it or freeze...)
1) The smoke/soot on start up, i think, has been solved; i believe it was from the wick sitting for months without being used---and there was some waxy residue on it. A few uses, i think, burned it off. Also, fine-tuning of the wick height helped to get a clean burn. So, there's really no smoke or odor anymore. After you shut it off, sometimes it does smell like a bus station, but i like that.......
2) With crappy levittown insulation, that is to say NO insulation, the heater gets the garage not "toasty," but comfortable enough where i don't feel cold and could work for hours. It sort of feels like having the A/C on high in the summer which takes a little getting use to with a winter mindset. The garage is, i think, roughly 430 square feet with, i believe a 10ft ceiling but could be 12?
i'm from the school of less insulation vs. more insulation; This way you get more air circulation (important especially now, with covid). Ok, you don't get that cozy/toasty feel, but: Less headaches, sickness etc. Did you ever notice how easy it is to get sick while riding on an airplane? That's because they are trying to get better mpg by recirculating the air vs. taking in outside air.
(Note: if any avation types are out there and this is wrong, let me know. But i did read that from a pilot)
i am "sold" on kerosene for now. It is about $3.16 per gallon now where i'm at, and one gallon lasts about 8 hrs.
Another side benefit of kerosene is, i hear you can cook hot dogs on top of the heater. i haven't tried it yet, though.